Heat exchange plate, plate heat exchanger and heat exchange system

Abstract

The invention provides a heat exchange plate, a plate heat exchanger and a heat exchange system.The heat exchange plate is provided with a plurality of infinitesimal units, the projection of each infinitesimal unit in the thickness direction of the heat exchange plate is hexagonal, and six concave parts of each infinitesimal unit are located at the six corners of the infinitesimal unit correspondingly; one heat exchange part of the infinitesimal unit is located in the center of the infinitesimal unit, and six protruding parts of the infinitesimal unit are arranged in the infinitesimal unit and are arranged in a hexagon shape with the heat exchange part as the center; the heat exchange parts are heat exchange protrusions, and the heat exchange protrusions and the protruding parts are the same in protruding direction and protruding height. Or the heat exchange part is a heat exchange recess, and the recess direction and the recess height of the heat exchange recess and the recess part are the same. The single infinitesimal unit of the heat exchange plate can form two-stage turbulent flow force, the turbulent flow effect is enhanced in a multiplied mode, the flow distribution uniformity is improved, and therefore the heat exchange performance is improved, the number of welding positions can be increased through the single infinitesimal unit, the welding structure strength is improved, and the heat exchange performance is improved.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange technology, and in particular to a heat exchange plate, a plate heat exchanger having the heat exchange plate, and a heat exchange system having the plate heat exchanger. Background Art

[0002] A plate heat exchanger is a highly efficient heat exchanger composed of multiple stacked metal plates with a specific point-wave heat exchange structure. The point-wave heat exchange structure of two adjacent plates forms interlaced fluid channels, allowing the cold and hot fluids to flow through the adjacent channels, exchanging heat. Plate heat exchangers offer high heat exchange efficiency, light weight, minimal footprint, compact structure, and long service life. They are widely used in cooling and heating, waste heat recovery, chemical engineering, aerospace, and automotive batteries, and have a significant market and development prospects.

[0003] See also Figure 1 The point wave heat exchange structure of the existing heat exchange plate is distributed in the horizontal and vertical directions by multiple micro-units 10, and the projection of each micro-unit 10 in the thickness direction of the heat exchange plate is arranged in a quadrilateral. A first protrusion 11 is respectively provided at the four corners of each quadrilateral micro-unit 10, a first recess 12 is provided in the middle of two adjacent first protrusions 11 in the horizontal direction, and a second recess 13 is provided in the middle of two adjacent first protrusions 11 in the vertical direction, and a second protrusion 14 is provided in the center of the quadrilateral micro-unit 10, wherein the protrusion direction of the first protrusion 11 and the second protrusion 14 are the same, the recess direction of the first recess 12 and the second recess 13 are the same, and the recess direction of the first recess 12 is opposite to the protrusion direction of the first protrusion 11 in the thickness direction of the heat exchange plate, so that the first protrusion 11, the second protrusion 14, the first recess 12 and the second recess 13 can disturb the fluid medium in the fluid channel.

[0004] However, since the projection of the micro-unit 10 of the existing heat exchange plate in the thickness direction of the heat exchange plate is arranged in a quadrilateral shape, a second protrusion 14 is located at the center of the quadrilateral micro-unit 10, and four first protrusions 11, two first recesses 12, and two second recesses 13 are respectively arranged on the outer periphery of the quadrilateral micro-unit 10, a single micro-unit 10 only has a first-level flow disturbance force, resulting in a poor flow disturbance effect, which in turn affects the flow distribution uniformity of the fluid medium in the fluid channel, resulting in insufficient heat exchange capacity. In addition, the existing two adjacent heat exchange plates are formed by welding their respective protrusions to protrusions or recesses to recesses to form a fluid channel. The four first protrusions 11 and one second protrusion 14 form five welding positions, and the two first recesses 12 and two second recesses 13 form four welding positions. As a result, the existing single micro-unit 10 can only form four or five welding positions. The number of welding positions is small, which affects the strength of the welding structure and thus the heat exchange capacity. Summary of the Invention

[0005] The first purpose of the present invention is to provide a heat exchange plate so that a single microelement unit can form a two-level turbulence force, thereby multiplying the turbulence effect, and then improving the flow distribution uniformity to improve the heat exchange performance, and a single microelement unit can increase the number of welding positions to improve the strength of the welding structure and further improve the heat exchange performance.

[0006] A second object of the present invention is to provide a plate heat exchanger having the above-mentioned heat exchange plates.

[0007] A third object of the present invention is to provide a heat exchange system having the above-mentioned plate heat exchanger.

[0008] In order to achieve the first purpose of the present invention, the present invention provides a heat exchange plate, which is provided with a plurality of micro-units, and the projection of each micro-unit in the thickness direction of the heat exchange plate is hexagonal, and two adjacent micro-units are connected by an edge, and each micro-unit includes a heat exchange portion, six protrusions and six recessed portions, the six recessed portions are respectively located at the six corners of the micro-unit, and one heat exchange portion is located at the center of the micro-unit, and the six protrusions are arranged in the micro-unit and are hexagonally arranged with the heat exchange portion as the center, and the protruding direction of the protruding portion and the recessed direction of the recessed portion are opposite in the thickness direction of the heat exchange plate; the heat exchange portion is a heat exchange protrusion, and the protruding direction and protruding height of the heat exchange protrusion and the protruding portion are the same; or, the heat exchange portion is a heat exchange recess, and the recessed direction and recessed height of the heat exchange recess and the recessed portion are the same.

[0009] A preferred solution is that a protrusion is arranged opposite to the middle of a side of the micro unit.

[0010] A further solution is that the first welding surface of the protrusion away from the recessed portion has a long side axis and a short side axis that are perpendicular to each other, and one of the long side axes extends toward the middle of a side of the micro unit.

[0011] A further solution is that a protrusion is arranged opposite to a corner.

[0012] A further solution is that each micro unit further includes six peripheral protrusions, one peripheral protrusion is located in the middle of one side of the micro unit, and the protrusion direction and protrusion height of the peripheral protrusion and the protrusion portion are the same.

[0013] A further solution is that the first welding surface of the protrusion away from the recessed portion has a long side axis and a short side axis that are perpendicular to each other, and one of the long side axes extends toward a corner.

[0014] A further solution is that the first welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus.

[0015] A further solution is that the areas of at least two welding surfaces among the first welding surface of the protrusion away from the recessed portion, the second welding surface of the recessed portion away from the protrusion, and the third welding surface of the heat exchange portion are different.

[0016] In order to achieve the second object of the present invention, the present invention provides a plate heat exchanger comprising at least three heat exchange plates, wherein the heat exchange plates are the above-mentioned heat exchange plates, and the plurality of heat exchange plates are stacked in the thickness direction of the plate heat exchanger; Among the three adjacent heat exchange plates, the heat exchange recess of the first heat exchange plate contacts the heat exchange recess of the second heat exchange plate, and the recess of the first heat exchange plate contacts the recess of the second heat exchange plate to form a first fluid channel; the raised portion of the second heat exchange plate contacts the raised portion of the third heat exchange plate to form a second fluid channel; Alternatively, among three adjacent heat exchange plates, the recessed portion of the first heat exchange plate contacts the recessed portion of the second heat exchange plate to form a third fluid channel; the heat exchange protrusion of the second heat exchange plate contacts the heat exchange protrusion of the third heat exchange plate, and the protrusion of the second heat exchange plate contacts the protrusion of the third heat exchange plate to form a fourth fluid channel.

[0017] In order to achieve the third object of the present invention, the present invention provides a heat exchange system, including a plate heat exchanger, and the plate heat exchanger is the plate heat exchanger mentioned above.

[0018] As can be seen from the above scheme, the projection of each micro-unit of the heat exchange plate of the present invention in the thickness direction of the heat exchange plate is arranged in a hexagonal shape, and two adjacent micro-units are connected by an edge, so that six hexagonal micro-units are arranged around the periphery of a hexagonal micro-unit. In addition, each micro-unit of the present invention includes a heat exchange portion, six protrusions and six recesses, the six recesses are respectively located at the six corners of the micro-unit, and a heat exchange portion is located at the center of the micro-unit. The six protrusions are arranged in the micro-unit and arranged in a hexagonal shape with the heat exchange portion as the center, so that a first-level turbulent flow force is formed between the heat exchange portion located at the center of the micro-unit and the six protrusions arranged in the hexagonal shape, and a second-level turbulent flow force is formed between the six protrusions arranged in the hexagonal shape and the six recesses located at the six corners of the hexagonal micro-unit, so that a single micro-unit can form two-level turbulent flow force, so that the turbulent flow effect is doubled, thereby improving the uniformity of flow distribution.

[0019] At the same time, in the plate heat exchanger of the present invention, among the three adjacent heat exchange plates, the heat exchange portion of the first heat exchange plate contacts the heat exchange portion of the second heat exchange plate, and the recessed portion of the first heat exchange plate contacts the recessed portion of the second heat exchange plate to form a first fluid channel, then a single hexagonal micro-unit can form seven welding positions in the first fluid channel; the raised portion of the second heat exchange plate contacts the raised portion of the third heat exchange plate to form a second fluid channel, then a single hexagonal micro-unit can form six welding positions in the second fluid channel, so that a single hexagonal micro-unit of the present invention can form six or seven welding positions, so that the number of welding positions is increased, thereby improving the strength of the welding structure.

[0020] Therefore, a single microelement unit of the heat exchange plate of the present invention can form a two-level turbulence force, thereby multiplying the turbulence effect, and then improving the uniformity of flow distribution to improve the heat exchange performance, and a single microelement unit can increase the number of welding positions to improve the strength of the welding structure and further improve the heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the quadrilateral microelement of the existing heat exchange plate.

[0022] Figure 2 It is a partial structural diagram of the first embodiment of the plate heat exchanger of the present invention.

[0023] Figure 3 It is a partial structural exploded view of the first embodiment of the plate heat exchanger of the present invention.

[0024] Figure 4 It is a front view of the partial structure of the first embodiment of the plate heat exchanger of the present invention.

[0025] Figure 5 yes Figure 4Cross-sectional view at AA.

[0026] Figure 6 It is a structural diagram of the coordination of single micro-units of three adjacent heat exchange plates in the first embodiment of the plate heat exchanger of the present invention.

[0027] Figure 7 It is an exploded front view of the cooperation of multiple micro units of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0028] Figure 8 It is a front view of a single micro-unit of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0029] Figure 9 It is a structural diagram of a single microelement unit of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0030] Figure 10 It is a front view of a single micro-unit of a heat exchange plate in the second embodiment of the plate heat exchanger of the present invention.

[0031] Figure 11 It is an exploded front view of the cooperation of multiple micro units of the heat exchange plate in the third embodiment of the plate heat exchanger of the present invention.

[0032] Figure 12 It is a structural diagram of the coordination of single micro-units of three adjacent heat exchange plates in the third embodiment of the plate heat exchanger of the present invention.

[0033] Figure 13 It is a front view of the coordination of a single micro-unit of three adjacent heat exchange plates in the third embodiment of the plate heat exchanger of the present invention.

[0034] Figure 14 yes Figure 13 Cross-sectional view at BB.

[0035] Figure 15 yes Figure 13 Cross-sectional view at CC.

[0036] Figure 16 It is a structural diagram of a single microelement unit of a heat exchange plate in the third embodiment of the plate heat exchanger of the present invention.

[0037] Figure 17 It is an exploded front view of the cooperation of multiple micro units of the heat exchange plate in the fourth embodiment of the plate heat exchanger of the present invention.

[0038] Figure 18 This is a structural diagram of the coordination of single micro-units of three adjacent heat exchange plates in the fourth embodiment of the plate heat exchanger of the present invention.

[0039] Figure 19It is a front view of the coordination of a single micro-unit of three adjacent heat exchange plates in the fourth embodiment of the plate heat exchanger of the present invention.

[0040] Figure 20 yes Figure 19 Cross-sectional view at DD.

[0041] Figure 21 yes Figure 19 Cross-sectional view at EE.

[0042] Figure 22 It is a structural diagram of a single microelement unit of a heat exchange plate in the fourth embodiment of the plate heat exchanger of the present invention.

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0044] The first embodiment of the plate heat exchanger: See also Figures 2 to 9 This embodiment discloses a plate heat exchanger 20 , comprising at least three heat exchange plates 21 , wherein the plurality of heat exchange plates 21 are stacked in a thickness direction of the plate heat exchanger 20 .

[0045] Among them, the heat exchange plate 21 of this embodiment is provided with a plurality of micro-units 210, and the projection of each micro-unit 210 in the thickness direction of the heat exchange plate 21 is arranged in a hexagonal shape, and two adjacent micro-units 210 are connected by an edge, that is, six hexagonal micro-units 210 are arranged around the periphery of a hexagonal micro-unit 210.

[0046] In addition, each microelement unit 210 of this embodiment includes a heat exchange portion, six protrusions 212 and six recesses 213. The six recesses 213 are respectively located at the six corners of the microelement unit 210, and one heat exchange portion is located at the center of the microelement unit 210. The six protrusions 212 are arranged in the microelement unit 210 and are arranged in a hexagonal shape with the heat exchange portion as the center, and the protruding direction of the protrusion 212 and the recessed direction of the recessed portion 213 are opposite in the thickness direction of the heat exchange plate 21.

[0047] Specifically, the heat exchange portion located at the center of the micro-unit 210 in this embodiment is a heat exchange recess 211. The heat exchange recess 211 and the recess 213 have the same recess direction and height. Thus, in the plate heat exchanger 20 of this embodiment, among the three adjacent heat exchange plates 21, the heat exchange recess 211 of the first heat exchange plate 21 contacts the heat exchange recess 211 of the second heat exchange plate 21, and the recess 213 of the first heat exchange plate 21 contacts the recess 213 of the second heat exchange plate 21, forming a first fluid channel 22; and the raised portion 212 of the second heat exchange plate 21 contacts the raised portion 212 of the third heat exchange plate 21, forming a second fluid channel 23.

[0048] Furthermore, copper foil solder is placed at the contact between the heat exchange recess 211 of the first heat exchange plate 21 and the heat exchange recess 211 of the second heat exchange plate 21, at the contact between the recess 213 of the first heat exchange plate 21 and the recess 213 of the second heat exchange plate 21, and at the contact between the raised portion 212 of the second heat exchange plate 21 and the raised portion 212 of the third heat exchange plate 21. The copper foil solder is melted at high temperature by vacuum brazing to form an integrated plate heat exchanger 20, thereby forming the first fluid channel 22 and the second fluid channel 23. The second fluid channel 23 circulates the heat exchange medium, such as refrigerant, and the first fluid channel 22 circulates the heat exchange medium, such as water.

[0049] In this embodiment, each micro-unit 210 of the heat exchange plate 21 is projected in a hexagonal shape in the thickness direction of the heat exchange plate 21 , and two adjacent micro-units 210 are connected by an edge, so that six hexagonal micro-units 210 are arranged around the periphery of a hexagonal micro-unit 210 . In addition, each microelement unit 210 of this embodiment includes a heat exchange portion, six protrusions 212 and six recesses 213. The six recesses 213 are respectively located at the six corners of the microelement unit 210, and one heat exchange portion is located at the center of the microelement unit 210. The six protrusions 212 are arranged in the microelement unit 210 and are arranged in a hexagonal shape with the heat exchange portion as the center, so that a first-level turbulent flow force is formed between the heat exchange portion located at the center of the microelement unit 210 and the six protrusions 212 arranged in a hexagonal shape, and a second-level turbulent flow force is formed between the six protrusions 212 arranged in a hexagonal shape and the six recesses 213 located at the six corners of the hexagonal microelement unit 210, so that a single microelement unit 210 can form two-level turbulent flow force, so that the turbulent flow effect is doubled, thereby improving the uniformity of flow distribution.

[0050] At the same time, in the plate heat exchanger 20 of this embodiment, among the three adjacent heat exchange plates 21, the heat exchange recess 211 of the first heat exchange plate 21 contacts the heat exchange recess 211 of the second heat exchange plate 21, and the recess 213 of the first heat exchange plate 21 contacts the recess 213 of the second heat exchange plate 21 to form a first fluid channel 22, then a single hexagonal micro-unit 210 can form seven welding positions in the first fluid channel 22; the raised portion 212 of the second heat exchange plate 21 contacts the raised portion 212 of the third heat exchange plate 21 to form a second fluid channel 23, then a single hexagonal micro-unit 210 can form six welding positions in the second fluid channel 23, so that a single hexagonal micro-unit 210 in this embodiment can form six or seven welding positions, so that the number of welding positions is increased, thereby improving the strength of the welding structure.

[0051] Therefore, a single microelement unit 210 of the heat exchange plate 21 of this embodiment can form a two-level turbulence force, thereby multiplying the turbulence effect, and then improving the flow distribution uniformity to improve the heat exchange performance, and a single microelement unit 210 can increase the number of welding positions to improve the strength of the welding structure and further improve the heat exchange performance.

[0052] To further enhance the flow turbulence capability, a raised portion 212 in a single hexagonal micro-unit 210 of this embodiment is disposed opposite the middle portion of a side of the micro-unit 210. Specifically, in this embodiment, at least two of the welded surfaces, namely, a first welded surface 2121 of the raised portion 212 facing away from the recessed portion 213, a second welded surface 2131 of the recessed portion 213 facing away from the raised portion 212, and a third welded surface 2111 of the heat exchange portion, have different areas. The third welded surface 2111 of the heat exchange portion is the third welded surface 2111 of the heat exchange recessed portion 211 of this embodiment facing away from the raised portion 212.

[0053] Among them, the first welding surface 2121 of the raised portion 212 of this embodiment is one of the shapes selected from the group consisting of an ellipse, a rounded rectangle, a rounded rhombus, a circle, a rounded square, a rounded triangle, a polygon with at least five sides, a parallelogram, etc., and the third welding surface 2111 of the heat exchange recess 211 of this embodiment is one of the shapes selected from the group consisting of an ellipse, a rounded rectangle, a rounded rhombus, a circle, a rounded square, a rounded triangle, a polygon with at least five sides, a parallelogram, etc.

[0054] Preferably, the first welding surface 2121 of the protrusion 212 of this embodiment is hexagonal, and the third welding surface 2111 of the heat exchange recess 211 of this embodiment is hexagonal.

[0055] In order to further improve the turbulence capability, the middle of one side of the hexagonal third welding surface 2111 of the heat exchange recess 211 of this embodiment is arranged opposite to a corner of the hexagonal micro-unit 210, and one side of the hexagonal first welding surface 2121 of the protrusion 212 of this embodiment is arranged parallel to one side of the hexagonal third welding surface 2111 of the heat exchange recess 211.

[0056] In order to improve the flow smoothness of the fluid medium and reduce the flow resistance, in this embodiment, the heat exchange recess 211 is connected to the six adjacent protrusions 212 by a smooth curved surface transition, the six protrusions 212 are connected to the six recesses 213 by a smooth curved surface transition, and the adjacent two protrusions 212 are connected to the smooth curved surface transition, and the adjacent two recesses 213 are connected to the smooth curved surface transition.

[0057] The second embodiment of the plate heat exchanger: As an explanation of the second embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger are described below.

[0058] See also Figure 10 In this embodiment, the first welded surface 2121' of the raised portion 212', located away from the recessed portion 213', in a single hexagonal micro-unit 210' of the heat exchange plate has a long axis 2122 and a short axis 2123 perpendicular to each other. One long axis 2122 extends toward the middle of a side of the micro-unit 210'. This allows the long axes 2122 of the first welded surfaces 2121' of the six raised portions 212' in a single hexagonal micro-unit 210' of the heat exchange plate to extend radially from the heat exchange portion, further enhancing flow turbulence. Specifically, the first welded surface 2121' in this embodiment is one of an ellipse, a rounded rectangle, or a rounded rhombus.

[0059] The first option is that in the three adjacent heat exchange plates of the plate heat exchanger of this embodiment, the third welding surface 2111' of the heat exchange recess 211' of the first heat exchange plate is in full contact with the third welding surface 2111' of the heat exchange recess 211' of the second heat exchange plate, and the second welding surface 2131' of the recess 213' of the first heat exchange plate is in full contact with the second welding surface 2131' of the recess 213' of the second heat exchange plate to form a first fluid channel; the first welding surface 2121' of the raised portion 212' of the second heat exchange plate is in full contact with the first welding surface 2121' of the raised portion 212' of the third heat exchange plate to form a second fluid channel. Thus, this arrangement enables full contact welding between the first welding surfaces 2121' of the two adjacent heat exchange plates having the long side axis 2122 and the short side axis 2123 perpendicularly arranged to each other, further greatly improving the strength of the welding structure and enhancing the heat exchange capacity.

[0060] Second, optionally, in the plate heat exchanger of this embodiment, in the three adjacent heat exchange plates, the third welding surface 2111' of the heat exchange recess 211' of the first heat exchange plate is in full contact with the third welding surface 2111' of the heat exchange recess 211' of the second heat exchange plate, and the second welding surface 2131' of the recess 213' of the first heat exchange plate is in full contact with the second welding surface 2131' of the recess 213' of the second heat exchange plate to form a first fluid channel; the first welding surface 2121' of the raised portion 212' of the second heat exchange plate and the first welding surface 2121' of the raised portion 212' of the third heat exchange plate intersect to form a partial contact to form a second fluid channel. Therefore, this setting method allows the first welding surfaces 2121' with the long side axis 2122 and the short side axis 2123 arranged perpendicular to each other between two adjacent heat exchange plates to intersect to form a local contact weld. Simulation calculations have proved that the heat exchange capacity of the non-full contact welding form is further improved compared with the full contact welding form. The heat exchange capacity can be further improved by about 15% on average, thereby further improving the heat exchange capacity while ensuring the strength of the welding structure.

[0061] The third embodiment of the plate heat exchanger: As an explanation of the third embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger are described below.

[0062] See also Figure 11 and Figure 16 In this embodiment, the heat exchange portion in a single hexagonal micro-unit 310 of the heat exchange plate is a heat exchange protrusion 311 , and the protrusion direction and protrusion height of the heat exchange protrusion 311 and the protrusion portion 312 are the same.

[0063] Thus, in the plate heat exchanger of this embodiment, among the three adjacent heat exchange plates, the second weld surface 3131 of the recessed portion 313 of the first heat exchange plate contacts the second weld surface 3131 of the recessed portion 313 of the second heat exchange plate to form a first fluid channel 33; the third weld surface 3111 of the heat exchange protrusion 311 of the second heat exchange plate contacts the third weld surface 3111 of the heat exchange protrusion 311 of the third heat exchange plate, and the first weld surface 3121 of the protrusion 312 of the second heat exchange plate contacts the first weld surface 3121 of the protrusion 312 of the third heat exchange plate to form a second fluid channel 32. In this embodiment, the heat exchange medium, such as refrigerant, circulates in the second fluid channel 32, and the heat exchange medium, such as water, circulates in the first fluid channel 33.

[0064] Therefore, in this embodiment, each microelement unit 310 includes a heat exchange protrusion 311, six protrusions 312 and six recesses 313. The six recesses 313 are respectively located at the six corners of the microelement unit 310, and one heat exchange protrusion 311 is located at the center of the microelement unit 310. The six protrusions 312 are arranged in the microelement unit 310 and are arranged in a hexagonal shape with the heat exchange protrusion 311 as the center, so that a first-level turbulence force is formed between the heat exchange protrusion 311 located at the center of the microelement unit 310 and the six protrusions 312 arranged in a hexagonal shape, and a second-level turbulence force is formed between the six protrusions 312 arranged in a hexagonal shape and the six recesses 313 located at the six corners of the hexagonal microelement unit 310, so that a single microelement unit 310 can form two-level turbulence force, so that the turbulence effect is doubled, thereby improving the uniformity of flow distribution.

[0065] The fourth embodiment of the plate heat exchanger: As an explanation of the fourth embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger are described below.

[0066] See also Figures 17 to 22In this embodiment, a protrusion 412 in a single hexagonal micro-unit 410 of the heat exchange plate is arranged opposite to a corner of the hexagonal micro-unit 410, so that a first-level turbulent flow force is formed between the heat exchange recess 411 located at the center of the micro-unit 410 and the six protrusions 412 arranged in a hexagon, and a second-level turbulent flow force is formed between the six protrusions 412 arranged in a hexagon and the six recesses 413 located at the six corners of the hexagonal micro-unit 410, so that a single micro-unit 410 can form two-level turbulent flow force, which doubles the turbulent flow effect and improves the uniformity of flow distribution.

[0067] In order to further enhance the flow disturbance capability, each micro-element unit 410 of this embodiment further includes six peripheral protrusions 414 , one peripheral protrusion 414 is located in the middle of one side of the micro-element unit 410 , and the protrusion direction and protrusion height of the peripheral protrusion 414 and the protrusion portion 412 are the same. Thus, in the plate heat exchanger of this embodiment, among three adjacent heat exchange plates, the heat exchange recess 411 of the first heat exchange plate contacts the heat exchange recess 411 of the second heat exchange plate, and the recess 413 of the first heat exchange plate contacts the recess 413 of the second heat exchange plate to form a first fluid channel 43. Thus, a single hexagonal micro-unit 410 of this embodiment can form seven welding points in the first fluid channel 43. The raised portion 412 of the second heat exchange plate contacts the raised portion 412 of the third heat exchange plate, and the peripheral raised portion 414 of the second heat exchange plate contacts the peripheral raised portion 414 of the third heat exchange plate to form a second fluid channel 42. Thus, a single hexagonal micro-unit 410 of this embodiment can form twelve welding points in the second fluid channel 42. In this embodiment, the second fluid channel 42 of this embodiment circulates a heat exchange medium, such as a refrigerant, and the first fluid channel 43 of this embodiment circulates a heat exchange medium, such as water.

[0068] To further enhance flow turbulence, the first welded surface 4121 of the raised portion 412, distal from the recessed portion 413, in this embodiment has a long axis 4122 and a short axis 4123 perpendicular to each other. One long axis 4122 extends toward a corner of the micro-unit 410. This allows the long axes 4122 of the first welded surfaces 4121 of the six raised portions 412 in a single hexagonal micro-unit 410 of the heat exchange plate in this embodiment to extend radially from the heat exchange recess 411, further enhancing flow turbulence. Specifically, the first welded surface 4121 in this embodiment is one of an ellipse, a rounded rectangle, or a rounded rhombus.

[0069] The first option is that, in the three adjacent heat exchange plates of the plate heat exchanger of this embodiment, the third welding surface 4111 of the heat exchange recess 411 of the first heat exchange plate is in full contact with the third welding surface 4111 of the heat exchange recess 411 of the second heat exchange plate, and the second welding surface 4131 of the recess 413 of the first heat exchange plate is in full contact with the second welding surface 4131 of the recess 413 of the second heat exchange plate to form a first fluid channel 43; the first welding surface 4121 of the raised portion 412 of the second heat exchange plate is in full contact with the first welding surface 4121 of the raised portion 412 of the third heat exchange plate, and the fourth welding surface 4141 of the peripheral protrusion 414 of the second heat exchange plate is in full contact with the fourth welding surface 4141 of the peripheral protrusion 414 of the third heat exchange plate to form a second fluid channel 42. Therefore, this arrangement enables the first welding surfaces 4121 with the long side axis 4122 and the short side axis 4123 perpendicularly arranged between two adjacent heat exchange plates to form full contact welding, further greatly improving the strength of the welding structure and enhancing the heat exchange capacity.

[0070] Second, optionally, in the plate heat exchanger of this embodiment, among the three adjacent heat exchange plates, the third welding surface 4111 of the heat exchange recess 411 of the first heat exchange plate is completely in contact with the third welding surface 4111 of the heat exchange recess 411 of the second heat exchange plate, and the second welding surface 4131 of the recess 413 of the first heat exchange plate is completely in contact with the second welding surface 4131 of the recess 413 of the second heat exchange plate to form a first fluid channel 43; the first welding surface 4121 of the raised portion 412 of the second heat exchange plate intersects with the first welding surface 4121 of the raised portion 412 of the third heat exchange plate to form a partial contact, and the fourth welding surface 4141 of the peripheral protrusion 414 of the second heat exchange plate is completely in contact with the fourth welding surface 4141 of the peripheral protrusion 414 of the third heat exchange plate to form a second fluid channel 42. Therefore, this setting method allows the first welding surfaces 4121 with long side axes 4122 and short side axes 4123 arranged perpendicular to each other between two adjacent heat exchange plates to intersect to form a local contact weld. Simulation calculations have shown that the heat exchange capacity of the non-full contact welding form is further improved compared to the full contact welding form. The heat exchange capacity can be further improved by about 15% on average, thereby further improving the heat exchange capacity while ensuring the strength of the welding structure.

[0071] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. Heat exchange plate, provided with multiple micro units, characterized by: The projection of each micro-unit in the thickness direction of the heat exchange plate is arranged in a hexagonal shape, and two adjacent micro-units are connected by an edge; Each of the micro-units includes a heat exchange portion, six protrusions, and six recesses. The six recesses are located at the six corners of the micro-unit, and one heat exchange portion is located at the center of the micro-unit. The six protrusions are arranged in the micro-unit and in a hexagonal shape with the heat exchange portion as the center. The protruding directions of the protrusions and the recessed directions of the recesses are opposite to each other in the thickness direction of the heat exchange plate. The heat exchange portion is a heat exchange protrusion, and the protrusion direction and protrusion height of the heat exchange protrusion and the protrusion portion are the same; or, the heat exchange portion is a heat exchange depression, and the heat exchange depression and the depression portion are the same in depression direction and depression height.

2. The heat exchange plate according to claim 1, characterized in that: One of the protrusions is arranged opposite to the middle of one side of the micro unit.

3. The heat exchange plate according to claim 2, characterized in that: The first welding surface of the protrusion away from the recessed portion has a long side axis and a short side axis that are perpendicular to each other, and one of the long side axes extends toward the middle of a side of the micro unit.

4. The heat exchange plate according to claim 1, characterized in that: One of the protrusions is arranged opposite to one of the corners.

5. The heat exchange plate according to claim 4, characterized in that: Each of the micro-units further includes six peripheral protrusions, one of the peripheral protrusions is located in the middle of one side of the micro-unit, and the protrusion direction and protrusion height of the peripheral protrusion and the protrusion portion are the same.

6. The heat exchange plate according to claim 4, characterized in that: The first welding surface of the protrusion away from the recessed portion has a long side axis and a short side axis that are perpendicular to each other, and one of the long side axes extends toward one of the corners.

7. The heat exchange plate according to claim 3 or 6, characterized in that: The first welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus.

8. The heat exchange plate according to any one of claims 1 to 6, characterized in that: At least two of the first welding surface of the protrusion away from the recessed portion, the second welding surface of the recessed portion away from the protrusion, and the third welding surface of the heat exchange portion have different areas.

9. A plate heat exchanger comprising at least three heat exchange plates, characterized in that: The heat exchange plate is the heat exchange plate according to any one of claims 1 to 8, and a plurality of the heat exchange plates are stacked in the thickness direction of the plate heat exchanger; Among the three adjacent heat exchange plates, the heat exchange recess of the first heat exchange plate contacts the heat exchange recess of the second heat exchange plate, and the recessed portion of the first heat exchange plate contacts the recessed portion of the second heat exchange plate, so as to form a first fluid channel; The raised portion of the second heat exchange plate contacts the raised portion of the third heat exchange plate to form a second fluid channel; Alternatively, among the three adjacent heat exchange plates, the recessed portion of the first heat exchange plate contacts the recessed portion of the second heat exchange plate to form a third fluid channel; The heat exchange protrusion of the second heat exchange plate contacts the heat exchange protrusion of the third heat exchange plate, and the protrusion of the second heat exchange plate contacts the protrusion of the third heat exchange plate to form a fourth fluid channel.

10. A heat exchange system including a plate heat exchanger, characterized in that: The plate heat exchanger is the plate heat exchanger according to claim 9.

Images